Full-duplex wireless based on a small-form-factor analog self-interference canceller

This paper presents a compact, dual polarized bistatic (two closely spaced transmit and receive radiators) patch antenna with excellent interport isolation performance. The presented antenna system employs differential receive mode operation for the cancellation of self-interference (SI) to achieve very high interport isolation for 2.4 GHz in-band full duplex (IBFD) applications. The presented antenna is based on two closely spaced radiators and a simple 3 dB/180° coupler for differentially excited receive mode operation. The 3 dB/180° coupler performs as a passive self-interference cancellation (SIC) circuit for the presented antenna. The small form-factor structure is realized through via interconnections between the receiving patch and SIC circuit. The prototype of the presented antenna characterizes better than 105 dB peak interport isolation. Moreover, the recorded interport isolation is more than 90 dB and 95 dB within 60 MHz and 40 MHz bandwidths, respectively. The measured gain and cross-polarization levels reflect superior radiation performance for the validation model of the proposed antenna. The presented antenna offers DC interport isolation too, which is required for active antenna applications. The novelty of this work is a compact (small form-factor) antenna structure with very high peak interport isolation along with wider SIC bandwidth as compared to previously reported antennas for full duplex applications.

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Electrical balance duplexing for small form factor realization of in-band full duplex

IEEE Communications Magazine ◽

10.1109/mcom.2015.7105648 ◽

2015 ◽

Vol 53 (5) ◽

pp. 102-110 ◽

Cited By ~ 33

Author(s):

Leo Laughlin ◽

Mark A. Beach ◽

Kevin A. Morris ◽

John L. Haine

Keyword(s):

Form Factor ◽

Full Duplex ◽

Small Form ◽

Small Form Factor

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Near-field recording for small form factor optical disks

The European Physical Journal Applied Physics ◽

10.1051/epjap:2007016 ◽

2007 ◽

Vol 37 (2) ◽

pp. 175-180 ◽

Cited By ~ 1

Author(s):

Jin-Hong Kim

Keyword(s):

Form Factor ◽

Near Field ◽

Small Form ◽

Field Recording ◽

Optical Disks ◽

Small Form Factor

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Design and Implementation Scheme of QSFP28 Optical Transceiver for Long-Reach Transmission Using PAM4 Modulation

Applied Sciences ◽

10.3390/app11062803 ◽

2021 ◽

Vol 11 (6) ◽

pp. 2803

Author(s):

Jae-Woo Kim ◽

Dong-Seong Kim ◽

Seung-Hwan Kim ◽

Sang-Moon Shin

Keyword(s):

Form Factor ◽

Low Cost ◽

Pulse Amplitude ◽

Small Form ◽

Transceiver Design ◽

Industrial Sites ◽

Design And Implementation ◽

Design Scheme ◽

Implementation Scheme ◽

Small Form Factor

A quad, small form-factor pluggable 28 Gbps optical transceiver design scheme is proposed. It is capable of transmitting 50 Gbps of data up to a distance of 40 km using modulation signals with a level-four pulse-amplitude. The proposed scheme is designed using a combination of electro-absorption-modulated lasers, transmitter optical sub-assembly, low-cost positive-intrinsic-native photodiodes, and receiver optical sub-assembly to achieve standard performance and low cost. Moreover, the hardware and firmware design schemes to implement the optical transceiver are presented. The results confirm the effectiveness of the proposed scheme and the performance of the manufactured optical transceiver, thereby confirming its applicability to real industrial sites.

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